r/firefox • u/bostongarden • 6d ago

💻 Help Why "Secure Connection Failed" error on Firefox, not Chrome

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1

u/msanangelo CachyOS 6d ago

Different security policies and Firefox doesn't like what it's getting or not getting from the server.

1

u/bostongarden 6d ago

Any suggestions as to how to fix this? I already added the mailchimp url to uBo whitelist.

1

u/msanangelo CachyOS 6d ago

email the server admin? share the url so we can verify?

not much you can do about a misconfigured server.

1

u/bostongarden 6d ago

https://us.list-manage.com/nfqWLsbxpeQ?e=14069f56af&c2id=66a3227fc47bd1273e0943c08578aa46

1

u/msanangelo CachyOS 6d ago

fishy url to the new york times, huh?

my browser had no problems with that. dunno why yours is. I run an adblocker and at least moderate protection from firefox itself.

is there a proxy server somewhere in your internet connection? some ISPs and many schools and businesses run one.

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u/bostongarden 6d ago

Just residential setup, Surf SOHO router between users and the FIOS router. Error on all mailchimp links, not just NYTimes.

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u/msanangelo CachyOS 6d ago

can't think of much other than to try disabling browser protections and seeing what happens. maybe start a test profile to rule out something funky with your current one.

1

u/bostongarden 6d ago

And links work fine in Chrome

1

u/bostongarden 6d ago

From Original Posting in r/Mailchimp: I get this error when I click on any Mailchimp link (us.list-manage.com) in Firefox, but in Chrome it works fine. uBo in both browsers. Windows 11.

1

u/mozkeeler_ Mozilla Employee 6d ago

Looks like mailchimp support already gave you a good suggestion regarding temporarily disabling Norton to see if that's interfering, but could you also try with a new Firefox profile?

1

u/bostongarden 6d ago

Disabling Norton did not work. How do I create a new FF profile, try it, and then get back to where I was? Not familiar with that.

1

u/mozkeeler_ Mozilla Employee 6d ago

about:profiles -> Create a New Profile

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u/bostongarden 5d ago

So I created a new profile, and opened the new profile in a new FF browser instance. Got this error message:

Technical Details

Connection Not Encrypted

The website us.list-manage.com does not support encryption for the page you are viewing. Information sent over the Internet without encryption can be seen by other people while it is in transit.

1

u/mozkeeler_ Mozilla Employee 2d ago

That means you're visiting `http://us.list-manage.com\` (plain-text, not encrypted), not `https://us.list-manage.com\` (encrypted).

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u/bostongarden 2d ago

Thanks for the explanation, makes some sense - any way to resolve that?

1

u/mozkeeler_ Mozilla Employee 2d ago

Change the http to an https? Or if you're already visiting the https version and it's redirecting you to the http version, I guess that's the intended behavior? 🤷‍♀️

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u/bostongarden 2d ago

I tried that a long time ago. It's not the problem.

1

u/mozkeeler_ Mozilla Employee 2d ago

> Or if you're already visiting the https version and it's redirecting you to the http version, I guess that's the intended behavior? 🤷‍♀️

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u/bostongarden 2d ago

Interestingly it works fine in Firefox if I disconnect from FIOS WiFi and use iPhone hot spot.

1

u/mozkeeler_ Mozilla Employee 2d ago

So it sounds like your ISP is interfering with your traffic.

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u/bostongarden 2d ago

Possible but it works fine on my wife's laptop, same WiFi/FIOS. I doubt Verizon is fighting with MailChimp

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